barzgar soltani 1389 modelsazi

The First International Conference on
Plant, Water, Soil & Weather Modeling
International Center for Science, High Technology &
Environmental Sciences
Shahid Bahonar University of Kerman
, Nov. , Kerman, Iran
abbarzgar@yahoo.com
afsoltani@yahoo.com
.

CERES
SHOOTGRO
AFRCWHEATSIRIUS
DEMETER
- Objective
- Formulation
- Parameterization
- Evaluation

.
TBD-TMP=DTT
0<DTT0=DTT ( )
TBD)-(TOD>DTTTBD)-(TOD=DTT
DTTTMPTBDTOD
.
0
0.2
0.4
0.6
0.8
1
1.2
0 5 10 15 20 25 30 35 40
TBDTOD
- Thermal time

(NGS)
TTHAR/TT=NGS ( )
NGSNGS >
TBD
TOD
TTEMR
TTTLG
TTBSG
TTTSG
TTHAR
(WSCFG)
- Normalized Growth Stage
- Water Stress Correction Factor for Growth

EPIC
(LAI)
LAIMX
(BSG)(BLS)
BLS
TTHAR
TTBSG
=BLS ( )
BLS<NGSLAIMX*NGS))*BL-(ALEXP+(NGS/NGS=LAI
BLS=>NGSBLS))-(1/NGS)-((1*BSGLAI=LAI
BSGLAIALBL
LLLAI / LAIMXNGS
LL
LAIMX
LAIMXi*PDEN))*BPPL-EXP(APPL+PDEN/(PDEN=LAIMX
PDENLAIMXi
APPLBPPL
(P ,P )
- Beginning of Seed Growth
- Beginning of Leaf Senescence

BLS
P
P
L
L
LAIMX
(FINT)
LAI)*KPAR(-EXP-1=FINT
KPAR
KPAR
LAI
(RUE)
- Fraction Intercept

TCFRUE*DVRUE*IRUE=RUE
RUE
RUE
RUETCFRUE
0
0.2
0.4
0.6
0.8
1
1.2
0 5 10 15 20 25 30 35 40
RUE)
(
RUE
DVRUE
DVRUE
IRUE
IRUE
- Radiation Use Efficiency
- Temperature Coefficient for Radiation Use Efficiency
- Development Radiation Use Efficiency

(DBP)
WSCFG*RUE*FINT*0.5*SRAD=DBP
SRAD
KPAR
DVRUE
TBRUE
TO RUE
TO RUE
TCRUE
IRUE
(WTOP)
1/HI)-(1/WGRN)-WVEG-HI/(WGRN=SGR
SGRWGRNWVEG
HI
- Daily Biomass Production
- Solar Radiation
- Top Weight
- Seed Growth Rate
- Grain Weight

HIi+DHI=HI
DHI
HIi
(TRLDM)
FRTRL*BSGDM=TRLDM
BSGDMFRTRL
(TRANSL)
TRLDM*TTBSG)-(TTTSG/DTT=TRANSL
TR-SEVP-DRIAN-IRGW+ERAIN+1-SWCi=SWCi
SWCiERAIN
IRGWDRIANSEVP
TR
- Vegetative weight
- Translocated Dry Matter
- Beginning Seed Growth Dry Matter
- Translocation Fraction
- Soil Water Content
- Effective Rain
- Irrigation Water
- Deep Drainage
- Soil Evaporation
- Transpiration

WSSL
WSSG
STRSDEP
KET
CALB
RMATLAI
SEVPMV
WETH

(RMSE)
R

C
C
SBEET
.
-
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Simulating Wheat growth and yield in Mashhad climate
A.B.Bazrgar , A.Soltani
. Scientific member, Agricultural Dep., Islamic Azad University, Kashmar Branch, Kashmar, Iran;
abbarzgar@yahoo.com
.Profesor of Agronomy Dep., Agricultural Sciences Faculty, Gorgan University of Agricultural Sciences & Natural Resources, Gorgan, Iran;
afsoltani@yahoo.com
Abstract:
Wheat is considered Iran's most strategically important crop and is cultivated on a large scale in
arid and semiarid environments of this country, where yield is limited by climatic factors. Crop
simulation models could use as tools to examine complex interactions of environment,
management and cultivar and their effects on yield variability in wheat production systems.
Nowadays more than wheat models have been published internationally. Many of these are
complex models require detailed weather data, soil characteristics and agronomic descriptions
(variety, sowing date, mineral fertilization, irrigation, etc.), which are often not available. Over the
past decade, the increased availability of regional yield data and improvements in modelling
technology has made it possible to advance regional-scale crop modelling. The aim of the present
work was to develop a simple model for simulating Wheat growth and yield in Mashhad condition.
To do this, we started with a simple modeling framework and try to simplified processes,
functional relations and parameters require for model. The model simulates crop phenology,
development of leaves as a function of temperature, accumulation of crop biomass as a function of
intercepted radiation, dry matter accumulation of grains as a function of time and temperature, and
soil water balance. The model uses a daily time step and readily available weather and soil
information. The model was tested using independent data from Mashhad's environmental
conditions. The agreement between simulated and observed grain yields showed the robustness of
the model in predicting wheat growth and yield for the conditions under studied. It was concluded
that, the model can be used in simulation studies of potential yield and production limitations in
Mashhad conditions.
Keywords: Wheat, Simulation, Model, Grain yield.

barzgar soltani 1389 modelsazi

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